Mysterious drive Z: appears!


  1. Posts : 3
    Windows 10
       #1

    Mysterious drive Z: appears!


    Hello every one, have a good day!
    Here i come with my recent problem as in thread title.

    Recently i found a Z: drive that i cannot acces or modify it in any way.
    Here is some data that i gathered:

    Code:
    DISKPART> detail disk
    
    Hitachi HTS541010A9E680
    Disk ID: {C0F04480-1D8C-4C58-B5F0-FFA6AEEAD2BB}
    Type   : RAID
    Status : Online
    Path   : 4
    Target : 0
    LUN ID : 0
    Location Path : PCIROOT(0)#PCI(1F02)#RAID(P04T00L00)
    Current Read-only State : No
    Read-only  : No
    Boot Disk  : No
    Pagefile Disk  : No
    Hibernation File Disk  : No
    Crashdump Disk  : No
    Clustered Disk  : No
    
      Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
      ----------  ---  -----------  -----  ----------  -------  ---------  --------
      Volume 1     D                NTFS   Partition     90 GB  Healthy
      Volume 2     E   APPS         NTFS   Partition    195 GB  Healthy
      Volume 3     F   DATA         NTFS   Partition    644 GB  Healthy
      Volume 4         Odzyskiwani  NTFS   Partition    300 MB  Healthy    Hidden
    * Volume 5     Z                FAT32  Partition    100 MB  Healthy    System
    Code:
    Microsoft Windows [Version 10.0.14393]
    (c) 2016 Microsoft Corporation. All rights reserved.
    
    C:\Windows\system32>takeown /F Z:\ /A /R /D Y
    ERROR: The parameter is incorrect.
    Mysterious drive Z: appears!-2017-01-15-12_29_24-local-disk-z_-properties.pngMysterious drive Z: appears!-2017-01-15-12_39_39-disk-management.png
    there is no security tab available neither that drive is listed in diskmgmt.msc.

    Please help me to explain what this bizzare creation is and how to get rid of it.
      My Computer

  2. Samuria's Avatar
    Posts : 6,115
    windows 10
       #2

    Welcome to the forum that is the boot drive for your UEFI drive you should in assign the drive letter and don't touch it in any way or you won't boot it's normal but should be hidden
      My Computer


  3. Posts : 3
    Windows 10
    Thread Starter
       #3

    Ok, found this much since posted:
    Mysterious drive Z: appears!-2017-01-15-13_10_10-process-monitor-sysinternals_-www.sysinternals.com.png
    Any ideas how come it suddenly appeared?
    What can I do to make it genuine hidden again?
      My Computer

  4. jumanji's Avatar
    Posts : 5,884
    Windows 10 Home 64bit Version 20H2
       #4

    HP Support Assistant creates this Z drive and it appears whenever I run "Check for updates and messages" It disappears after a restart. Nothing to worry about and lose sleep on it.
      My Computer

  5. jumanji's Avatar
    Posts : 5,884
    Windows 10 Home 64bit Version 20H2
       #5

    Continuing on the mysterious Z drive, it is found the HP Support Assistant gives the drive letter Z to the 260 MB EFI System Partition

    AOMEI Backupper when No Z drive is created

    Mysterious drive Z: appears!-efisytem.jpg

    AOMEI Backupper after HP Support Assistant created Z drive during the check for updates process. Note the 260MB EFI System Partition is now the Z drive.

    Mysterious drive Z: appears!-zdrive.jpg

    It is also noted that when the Z drive is present Device Manager shows 8 WAN Miniports under Network Adapters.

    Mysterious drive Z: appears!-wanminiport.jpg

    Though there has been many queries on this Z drive in HP Support forum there is no official explanation on this. Some of the explanations given by HP Support Agents are found ridiculous.

    Whatever, it is now proved beyond doubt that it is the EFI System Partition that takes on the Z drive letter and therefore no attempt should be made to delete it.

    On my system, after closing the HP Support Assistant and restarting the notebook, the Z drive vanishes. This has been consistent.

    However one should take care not to give drive letter Z to any mapped drive or any partition created that would clash with the Z drive created by HPSA.
      My Computer

  6. simrick's Avatar
    Posts : 16,137
    W10Prox64
       #6

    Hi @jumanji
    In my case, the reg edit from eightforums didn't work; also removing HP Support program didn't work.
    My Z drive appears as the same size/same used amount as the OS drive.

    Mysterious drive Z: appears!-z-drive.png

    The multiple network adapters are not present on here either.
    I created a new user, and the Z drive does not appear in the new user account.

    I know there was an issue about 1 month ago, where Avast had updated its program, the system had not been rebooted for a while (always sleeping), and Fast Startup was ON. The system was rebooted, and it booted into a temporary user. I eventually fixed things, but it appears that this problem remains (not positive if this is related or not). Any suggestions? Thanks.
      My Computer

  7. jumanji's Avatar
    Posts : 5,884
    Windows 10 Home 64bit Version 20H2
       #7

    I really have no idea of Avast connection with the Z drive but vaguely remember having read somewhere that there is an Avast connection though the Z drive is primarily created by HP Support Assistant. You may have to do more research on it :). I am only happy that the Z drive does not stick to my - rather my wife's - HP Notebook.Some of these problems can really make one go mad.
      My Computer

  8. simrick's Avatar
    Posts : 16,137
    W10Prox64
       #8

    jumanji said:
    I really have no idea of Avast connection with the Z drive but vaguely remember having read somewhere that there is an Avast connection though the Z drive is primarily created by HP Support Assistant. You may have to do more research on it :). I am only happy that the Z drive does not stick to my - rather my wife's - HP Notebook.Some of these problems can really make one go mad.
    Well, I created 2 new users, and neither one of them have the Z drive showing, so I am assuming this user account has been corrupted. I completely uninstalled Avast, and the Z-drive persists in this one account. I'll just copy the files over from the corrupt account to one of the new accounts, delete the corrupt user account, and be done with it.
      My Computer


 

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